diff options
Diffstat (limited to 'drivers/accessibility/speakup/speakup_soft.c')
| -rw-r--r-- | drivers/accessibility/speakup/speakup_soft.c | 430 |
1 files changed, 430 insertions, 0 deletions
diff --git a/drivers/accessibility/speakup/speakup_soft.c b/drivers/accessibility/speakup/speakup_soft.c new file mode 100644 index 000000000000..9a7029539f35 --- /dev/null +++ b/drivers/accessibility/speakup/speakup_soft.c @@ -0,0 +1,430 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* speakup_soft.c - speakup driver to register and make available + * a user space device for software synthesizers. written by: Kirk + * Reiser <kirk@braille.uwo.ca> + * + * Copyright (C) 2003 Kirk Reiser. + * + * this code is specificly written as a driver for the speakup screenreview + * package and is not a general device driver. + */ + +#include <linux/unistd.h> +#include <linux/miscdevice.h> /* for misc_register, and MISC_DYNAMIC_MINOR */ +#include <linux/poll.h> /* for poll_wait() */ + +/* schedule(), signal_pending(), TASK_INTERRUPTIBLE */ +#include <linux/sched/signal.h> + +#include "spk_priv.h" +#include "speakup.h" + +#define DRV_VERSION "2.6" +#define PROCSPEECH 0x0d +#define CLEAR_SYNTH 0x18 + +static int softsynth_probe(struct spk_synth *synth); +static void softsynth_release(void); +static int softsynth_is_alive(struct spk_synth *synth); +static unsigned char get_index(struct spk_synth *synth); + +static struct miscdevice synth_device, synthu_device; +static int init_pos; +static int misc_registered; + +static struct var_t vars[] = { + { CAPS_START, .u.s = {"\x01+3p" } }, + { CAPS_STOP, .u.s = {"\x01-3p" } }, + { PAUSE, .u.n = {"\x01P" } }, + { RATE, .u.n = {"\x01%ds", 2, 0, 9, 0, 0, NULL } }, + { PITCH, .u.n = {"\x01%dp", 5, 0, 9, 0, 0, NULL } }, + { INFLECTION, .u.n = {"\x01%dr", 5, 0, 9, 0, 0, NULL } }, + { VOL, .u.n = {"\x01%dv", 5, 0, 9, 0, 0, NULL } }, + { TONE, .u.n = {"\x01%dx", 1, 0, 2, 0, 0, NULL } }, + { PUNCT, .u.n = {"\x01%db", 0, 0, 2, 0, 0, NULL } }, + { VOICE, .u.n = {"\x01%do", 0, 0, 7, 0, 0, NULL } }, + { FREQUENCY, .u.n = {"\x01%df", 5, 0, 9, 0, 0, NULL } }, + { DIRECT, .u.n = {NULL, 0, 0, 1, 0, 0, NULL } }, + V_LAST_VAR +}; + +/* These attributes will appear in /sys/accessibility/speakup/soft. */ + +static struct kobj_attribute caps_start_attribute = + __ATTR(caps_start, 0644, spk_var_show, spk_var_store); +static struct kobj_attribute caps_stop_attribute = + __ATTR(caps_stop, 0644, spk_var_show, spk_var_store); +static struct kobj_attribute freq_attribute = + __ATTR(freq, 0644, spk_var_show, spk_var_store); +static struct kobj_attribute pitch_attribute = + __ATTR(pitch, 0644, spk_var_show, spk_var_store); +static struct kobj_attribute inflection_attribute = + __ATTR(inflection, 0644, spk_var_show, spk_var_store); +static struct kobj_attribute punct_attribute = + __ATTR(punct, 0644, spk_var_show, spk_var_store); +static struct kobj_attribute rate_attribute = + __ATTR(rate, 0644, spk_var_show, spk_var_store); +static struct kobj_attribute tone_attribute = + __ATTR(tone, 0644, spk_var_show, spk_var_store); +static struct kobj_attribute voice_attribute = + __ATTR(voice, 0644, spk_var_show, spk_var_store); +static struct kobj_attribute vol_attribute = + __ATTR(vol, 0644, spk_var_show, spk_var_store); + +/* + * We should uncomment the following definition, when we agree on a + * method of passing a language designation to the software synthesizer. + * static struct kobj_attribute lang_attribute = + * __ATTR(lang, 0644, spk_var_show, spk_var_store); + */ + +static struct kobj_attribute delay_time_attribute = + __ATTR(delay_time, 0644, spk_var_show, spk_var_store); +static struct kobj_attribute direct_attribute = + __ATTR(direct, 0644, spk_var_show, spk_var_store); +static struct kobj_attribute full_time_attribute = + __ATTR(full_time, 0644, spk_var_show, spk_var_store); +static struct kobj_attribute jiffy_delta_attribute = + __ATTR(jiffy_delta, 0644, spk_var_show, spk_var_store); +static struct kobj_attribute trigger_time_attribute = + __ATTR(trigger_time, 0644, spk_var_show, spk_var_store); + +/* + * Create a group of attributes so that we can create and destroy them all + * at once. + */ +static struct attribute *synth_attrs[] = { + &caps_start_attribute.attr, + &caps_stop_attribute.attr, + &freq_attribute.attr, +/* &lang_attribute.attr, */ + &pitch_attribute.attr, + &inflection_attribute.attr, + &punct_attribute.attr, + &rate_attribute.attr, + &tone_attribute.attr, + &voice_attribute.attr, + &vol_attribute.attr, + &delay_time_attribute.attr, + &direct_attribute.attr, + &full_time_attribute.attr, + &jiffy_delta_attribute.attr, + &trigger_time_attribute.attr, + NULL, /* need to NULL terminate the list of attributes */ +}; + +static struct spk_synth synth_soft = { + .name = "soft", + .version = DRV_VERSION, + .long_name = "software synth", + .init = "\01@\x01\x31y\n", + .procspeech = PROCSPEECH, + .delay = 0, + .trigger = 0, + .jiffies = 0, + .full = 0, + .startup = SYNTH_START, + .checkval = SYNTH_CHECK, + .vars = vars, + .io_ops = NULL, + .probe = softsynth_probe, + .release = softsynth_release, + .synth_immediate = NULL, + .catch_up = NULL, + .flush = NULL, + .is_alive = softsynth_is_alive, + .synth_adjust = NULL, + .read_buff_add = NULL, + .get_index = get_index, + .indexing = { + .command = "\x01%di", + .lowindex = 1, + .highindex = 5, + .currindex = 1, + }, + .attributes = { + .attrs = synth_attrs, + .name = "soft", + }, +}; + +static char *get_initstring(void) +{ + static char buf[40]; + char *cp; + struct var_t *var; + + memset(buf, 0, sizeof(buf)); + cp = buf; + var = synth_soft.vars; + while (var->var_id != MAXVARS) { + if (var->var_id != CAPS_START && var->var_id != CAPS_STOP && + var->var_id != PAUSE && var->var_id != DIRECT) + cp = cp + sprintf(cp, var->u.n.synth_fmt, + var->u.n.value); + var++; + } + cp = cp + sprintf(cp, "\n"); + return buf; +} + +static int softsynth_open(struct inode *inode, struct file *fp) +{ + unsigned long flags; + /*if ((fp->f_flags & O_ACCMODE) != O_RDONLY) */ + /* return -EPERM; */ + spin_lock_irqsave(&speakup_info.spinlock, flags); + if (synth_soft.alive) { + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + return -EBUSY; + } + synth_soft.alive = 1; + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + return 0; +} + +static int softsynth_close(struct inode *inode, struct file *fp) +{ + unsigned long flags; + + spin_lock_irqsave(&speakup_info.spinlock, flags); + synth_soft.alive = 0; + init_pos = 0; + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + /* Make sure we let applications go before leaving */ + speakup_start_ttys(); + return 0; +} + +static ssize_t softsynthx_read(struct file *fp, char __user *buf, size_t count, + loff_t *pos, int unicode) +{ + int chars_sent = 0; + char __user *cp; + char *init; + size_t bytes_per_ch = unicode ? 3 : 1; + u16 ch; + int empty; + unsigned long flags; + DEFINE_WAIT(wait); + + if (count < bytes_per_ch) + return -EINVAL; + + spin_lock_irqsave(&speakup_info.spinlock, flags); + synth_soft.alive = 1; + while (1) { + prepare_to_wait(&speakup_event, &wait, TASK_INTERRUPTIBLE); + if (synth_current() == &synth_soft) { + if (!unicode) + synth_buffer_skip_nonlatin1(); + if (!synth_buffer_empty() || speakup_info.flushing) + break; + } + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + if (fp->f_flags & O_NONBLOCK) { + finish_wait(&speakup_event, &wait); + return -EAGAIN; + } + if (signal_pending(current)) { + finish_wait(&speakup_event, &wait); + return -ERESTARTSYS; + } + schedule(); + spin_lock_irqsave(&speakup_info.spinlock, flags); + } + finish_wait(&speakup_event, &wait); + + cp = buf; + init = get_initstring(); + + /* Keep 3 bytes available for a 16bit UTF-8-encoded character */ + while (chars_sent <= count - bytes_per_ch) { + if (synth_current() != &synth_soft) + break; + if (speakup_info.flushing) { + speakup_info.flushing = 0; + ch = '\x18'; + } else if (init[init_pos]) { + ch = init[init_pos++]; + } else { + if (!unicode) + synth_buffer_skip_nonlatin1(); + if (synth_buffer_empty()) + break; + ch = synth_buffer_getc(); + } + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + + if ((!unicode && ch < 0x100) || (unicode && ch < 0x80)) { + u_char c = ch; + + if (copy_to_user(cp, &c, 1)) + return -EFAULT; + + chars_sent++; + cp++; + } else if (unicode && ch < 0x800) { + u_char s[2] = { + 0xc0 | (ch >> 6), + 0x80 | (ch & 0x3f) + }; + + if (copy_to_user(cp, s, sizeof(s))) + return -EFAULT; + + chars_sent += sizeof(s); + cp += sizeof(s); + } else if (unicode) { + u_char s[3] = { + 0xe0 | (ch >> 12), + 0x80 | ((ch >> 6) & 0x3f), + 0x80 | (ch & 0x3f) + }; + + if (copy_to_user(cp, s, sizeof(s))) + return -EFAULT; + + chars_sent += sizeof(s); + cp += sizeof(s); + } + + spin_lock_irqsave(&speakup_info.spinlock, flags); + } + *pos += chars_sent; + empty = synth_buffer_empty(); + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + if (empty) { + speakup_start_ttys(); + *pos = 0; + } + return chars_sent; +} + +static ssize_t softsynth_read(struct file *fp, char __user *buf, size_t count, + loff_t *pos) +{ + return softsynthx_read(fp, buf, count, pos, 0); +} + +static ssize_t softsynthu_read(struct file *fp, char __user *buf, size_t count, + loff_t *pos) +{ + return softsynthx_read(fp, buf, count, pos, 1); +} + +static int last_index; + +static ssize_t softsynth_write(struct file *fp, const char __user *buf, + size_t count, loff_t *pos) +{ + unsigned long supplied_index = 0; + int converted; + + converted = kstrtoul_from_user(buf, count, 0, &supplied_index); + + if (converted < 0) + return converted; + + last_index = supplied_index; + return count; +} + +static __poll_t softsynth_poll(struct file *fp, struct poll_table_struct *wait) +{ + unsigned long flags; + __poll_t ret = 0; + + poll_wait(fp, &speakup_event, wait); + + spin_lock_irqsave(&speakup_info.spinlock, flags); + if (synth_current() == &synth_soft && + (!synth_buffer_empty() || speakup_info.flushing)) + ret = EPOLLIN | EPOLLRDNORM; + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + return ret; +} + +static unsigned char get_index(struct spk_synth *synth) +{ + int rv; + + rv = last_index; + last_index = 0; + return rv; +} + +static const struct file_operations softsynth_fops = { + .owner = THIS_MODULE, + .poll = softsynth_poll, + .read = softsynth_read, + .write = softsynth_write, + .open = softsynth_open, + .release = softsynth_close, +}; + +static const struct file_operations softsynthu_fops = { + .owner = THIS_MODULE, + .poll = softsynth_poll, + .read = softsynthu_read, + .write = softsynth_write, + .open = softsynth_open, + .release = softsynth_close, +}; + +static int softsynth_probe(struct spk_synth *synth) +{ + if (misc_registered != 0) + return 0; + memset(&synth_device, 0, sizeof(synth_device)); + synth_device.minor = MISC_DYNAMIC_MINOR; + synth_device.name = "softsynth"; + synth_device.fops = &softsynth_fops; + if (misc_register(&synth_device)) { + pr_warn("Couldn't initialize miscdevice /dev/softsynth.\n"); + return -ENODEV; + } + + memset(&synthu_device, 0, sizeof(synthu_device)); + synthu_device.minor = MISC_DYNAMIC_MINOR; + synthu_device.name = "softsynthu"; + synthu_device.fops = &softsynthu_fops; + if (misc_register(&synthu_device)) { + pr_warn("Couldn't initialize miscdevice /dev/softsynthu.\n"); + return -ENODEV; + } + + misc_registered = 1; + pr_info("initialized device: /dev/softsynth, node (MAJOR 10, MINOR %d)\n", + synth_device.minor); + pr_info("initialized device: /dev/softsynthu, node (MAJOR 10, MINOR %d)\n", + synthu_device.minor); + return 0; +} + +static void softsynth_release(void) +{ + misc_deregister(&synth_device); + misc_deregister(&synthu_device); + misc_registered = 0; + pr_info("unregistered /dev/softsynth\n"); + pr_info("unregistered /dev/softsynthu\n"); +} + +static int softsynth_is_alive(struct spk_synth *synth) +{ + if (synth_soft.alive) + return 1; + return 0; +} + +module_param_named(start, synth_soft.startup, short, 0444); + +MODULE_PARM_DESC(start, "Start the synthesizer once it is loaded."); + +module_spk_synth(synth_soft); + +MODULE_AUTHOR("Kirk Reiser <kirk@braille.uwo.ca>"); +MODULE_DESCRIPTION("Speakup userspace software synthesizer support"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRV_VERSION); |